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Variable Interest Entities - Additional Information - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]      
Asset management fees $ 1,717 $ 6,574 $ 5,646
Held to maturity security 8,557 29,352  
Income from investment in CLO warehouse entities 2,226 3,184 1,151
Collateralized Loan Obligation Funds      
Variable Interest Entity [Line Items]      
Held to maturity security 8,557 3,380  
Income from investment in CLO warehouse entities 2,226 3,184 $ 1,151
Collateralized Loan Obligation Funds | Warehouse CLO Funds      
Variable Interest Entity [Line Items]      
Equity investments $ 0 $ 21,217